Pelvimeter



April 3, 1934- R. J. PIERI ET AL PELVIMETER Filed Jan. 31, 1933 W/TNEssPatented Apr. 3, 1934 STATES PELVIMETER Raymond J. Pieri and John B. DeMattia, Syracuse, N. Y.; said Pieri assignor to said De MattiaApplication January 31,

6 Claims.

This invention relates to a pelvimeter adapted to be used moreparticularly for obtaining the dimensions of the human pelvis butobviously may be used for other perineal measurements or for obstetricalpurposes.

The main object is to provide a three-point contact instrument of thischaracter in which all of the contact points are relatively adjustabletoward and from a common axis while the entire instrument may be turnedabout said axis to bring the points into different angular relation.

Another object is to provide the proximal end of the instrument withsuitable means for indicating to the operator the relative positions andamount of opening of the contact jaws.

A further object is to pivotally connect the three jaws in such mannerthat all three jaws may be moved about one and the same axis and topermit one of the jaws to be moved about another axis at right angles tothe first-named axis.

Other objects and uses will be brought out in the following description.

In the drawing 2- Figure 1 is a top plan of a pelvimeter embodying thevarious features of our invention shown in its extreme open position byfull lines and in its closed position by dotted lines.

Figure 2 is a longitudinal sectional view taken in the plane of line 22,Figure 1, showing the third jaw by full lines in its closed position andby dotted lines in its open position.

Figure 3 is an enlarged transverse vertical sectional view taken on line33, Figure 2.

Figure 4 is an enlarged transverse sectional View taken on line 44,Figure 1.

Figure 5 is an enlarged longitudinal vertical sectional view taken online 5-5, Figure 1.

As illustrated, this instrument comprises a pair of similar opposedlevers 1 and 1 arranged side by side and having their intermediateportions provided respectively with overlapping lugs 2 and 3 which arepivotally connected to each other by means of a pivotal bolt 4, as shownmore clearly in Figure 3, said levers being extended longitudinally inopposite directions from the pivotal bolt to form handles 5 and 5 andjaws 6 and 6.

The handle ends 5 and 5' of the levers are provided with finger loops '7and '7 adapted to be engaged by the operator for opening and closing thejaws about the axis of the pivotal bolt 4.

The jaws 6 and 6 are somewhat longer than their respective handles 5 and5' and have their distal ends curved or deflected outwardly andterminating in slightly enlarged rounded contact ends or points 8 and 8'to contact with the walls of the pelvis or other cavity undermeasurement.

The lugs 3 of the lever 5' are spaced axially of the bolt 4 to form anintervening slot 3 in which the lug 2 is seated so that both of thelevers 1933, Serial No. 654,449

may swing in the same plane about the axis of said bolt.

The bolt 4 is provided with an enlarged head 4' abutting through themedium of a washer 4 against the upper face of the lug 3 and has itsother end extended beyond the lower face of said lug for receiving andsupporting a yoke 9 which is journaled on said extension to swing aboutthe axis of the bolt and is held in operative position by a nut 10engaging the lower reduced threaded end of the bolt, as shown moreclearly in Figure 3.

This yoke is provided with a downwardly extending arm 11 having itslower end disposed in a vertical plane at substantially right angles tothe plane of movement of the levers 5 and 5 for receiving and supportingan additional or third lever 12 in a manner presently described.

The intermediate portion of the yoke 9 is preferably disposed in a planeparallel with the plane of movement of the levers 5 and 5' or at rightangles to the axis of the bolt 4 and abuts against the underside of thelug 3 so as to turn freely about said axis.

The yoke 9 is also provided with a rearwardly and upwardly extending arm13 having its upper end 13 arched forwardly over the head of the bolt 4about the axis of movement of the additional or third lever 13, as shownmore clearly in Figure 2, said curved portion 13 constituting a scaleplate having linear graduations 13 upon its upper surface for a purposepresently described.

The additional or third lever 12 is pivotally connected to the extension11 of the yoke 9 by means of a pivotal bolt 14 having opposite enlargedheads 15 and 15 engaging the outer faces of the adjacent portions of theextension 11 and lever 12, one of said heads as 15' being adjustable totake up wear and to permit the parts 11 and 12 to be removed one fromthe other.

The pivotal bolt 14 is preferably arranged directly under the lower endof the bolt 4 at right angles thereto so that the lever 12 is free toswing vertically about said axis in a plane between the jaws 6 and 6' ofthe levers 1 and 1, as shown more clearly in Figures 1, 2 and 3.

The lever 12 extends forwardly and rearwardly beyond the pivot 14,the'rear end of said lever being provided with an upwardly and forwardlyprojecting extension 16 having a curved portion 16 concentric with theaxis of the pivotal bolt 14 and of about the same radius as the uppersurface of the scale plate 13' to move along the graduations 13 as thelever 12 is rocked about its axis.

The front end of the arcuate portion 16 of the extension 16 is enlargedlaterally to form opposite flanges 17 adapted to engage the oppositelongitudinal edges of the scale plate 13 for guiding the arm 16' alongsaid scale plate against relative lateral movement.

This enlarged end of the arm 16 is provided with a sight opening 18through which the graduations 13 are visible and is also provided with apointer 19 adapted to register with said graduations to indicate theamount of movement of the lever 12 from its normal closed position, asshown by full lines in Figure 2.

The rearwardly extending arm 16 of the lever 12 forms a finger loop nearthe proximal ends of the levers 1 and l to permit the operator tomanipulate the lever 12 simultaneously with the operation of the levers1 and 1.

The forwardly projecting end of the lever 12 constitutes a jaw normallyextending some distance beyond the front ends of the jaws 6 and 6 and isprovided at its distal end with an enlarged rounding contact surface 12adapted to contact with the walls of the cavity in which the jaws areinserted, the points 8, ,8 and 12 being arranged at the angles of atriangle.

A scale plate 20 is secured to the handle end of one of the levers as 5and extends laterally across the upper surface of and some distancebeyond the handle end of the other lever as 5 concentric with the axisof the pivotal bolt 4 and is provided with linear graduations 20' on itsupper surface.

The handle end of the other lever as 5 is provided with a relativelyfixed pointer 21 adapted to register with any one of the graduations ofthe plate 20 as the levers are opened and closed to indicate the amountof opening of the jaws 6.

The handle end 5 of the lever l is provided with a guide groove 22 forreceiving the adjacent portion of the scale plate 20 while the pointer21 extends from one side of the groove across a portion of the uppersurface of the plate 20 to hold the latter against vertical displacementfrom the groove and at the same time to bring the pointer into closeproximity to the graduated surface of the said plate, as shown moreclearly in Figures 4 and 5.

Operation When it is desired to obtain the dimensions of the inner wallsof a cavity, the jaws may be closed or brought into close proximity toeach other by means of the handles '7 and '7 and the loopshapedextension 16 at the proximal end of the instrument whereupon the jawsmay be expanded by the same means against the wall of the cavity anddimensions indicated by the scale plates 13' and 20 and their respectivepointers 19 and 21.

It will be evident, however, that the jaws 6 and 6' may be opened andclosed by their respective handles 5 and 5' independently of theoperation of the jaw 12 and that the latter jaw may also be operatedthrough the medium of the looped extension 16 independently of theoperation of the jaws 6 and 6'.

This intermediate jaw 12 may also be manipulated laterally relatively tothe jaws 6 and 6' about the axis of the pivotal bolt through the mediumof the yoke 9 and connection of the extension 16 with the scale plate13' to enable the operator to determine the contour of the cavityengaged by the contact member 12.

It is evident from the foregoing description that when the entireinstrument is being used it may be turned manually about itslongitudinal axis to bring the several contact points 8, 8 and 12 intoengagement with different portions of the cavity, or at the angles of atriangle.

This instrument is particularly simple, light, strong and durable andmay be easily manipulated to different positions for making measurementsof diiferent portions of the cavity, but obviously various changes maybe made in the detail construction without departing from the spirit ofthe invention.

What we claim is:

1. In a pelvimeter, a pair of levers and a yoke pivoted to each otherfor relative rocking movement, said levers having one end provided withhandles and their other ends deflected outwardly, and an additionallever pivoted to the yoke.

2. In a pelvimeter, a pair of levers and a yoke pivoted to each otherfor relative rocking movement, said levers having one end provided withhandles and their other ends deflected outwardly,

an additional lever pivoted to the yoke, a scale plate on the yokeconcentric with the pivotal axis of the additional lever, and anextension on the additional lever movable therewith along the scaleplate.

3. In a pelvimeter, a pair of levers arranged side by side and havingoverlapping lugs intermediate their ends, a pivotal bolt connecting saidlugs to permit lateral swinging movement of the levers, said levershaving handles at one end and outturned jaws on their other ends, a yokejournaled on the pivotal bolt to swing about the axis thereof, and anadditional lever pivoted to the yoke to swing about an axis at rightangles to that of the pivotal bolt.

4. In a pelvimeter, a pair of levers arranged side by side and havingoverlapping lugs intermediate their ends, a pivotal bolt connecting saidlugs to permit lateral swinging movement of the levers, said levershaving handles at one end and outturned jaws on their other ends, a yokejournaled on the pivotal bolt to swing about the axis thereof, anadditional lever pivoted to the yoke to swing about an axis at rightangles to that of the pivotal bolt and also adapted to swing with theyoke about the axis of the bolt.

5. In a pelvimeter, a pair of levers arranged side by side and havingoverlapping lugs intermediate their ends, a pivotal bolt connecting saidlugs to prevent lateral swinging movement of the levers, said levershaving handles at one end and outturned jaws on their other ends, a yokejournaled on the pivotal bolt to swing about the axis thereof, and anadditional lever pivoted to the yoke to swing about an axis at rightangles to that of the pivotal bolt, said yoke having an extensionconcentric with the axis of movement of the additional lever, and apointer on the additional lever movable along said extension as saidadditional lever is rocked about its pivotal axis. 6. A pelvimetercomprising a pair of levers, a pivotal bolt connecting said levers, ascale plate secured to one lever and extended across the other leverconcentric with said bolt, a yoke journaled on said bolt to swing aboutthe axis thereof, a third lever pivoted to said yoke to swing about anaxis at right angles to that of the bolt, a second scale plate securedto said yoke and concentric with the axis of movement of the thirdlever, and a pointer arm secured to the third lever and movabletherewith along the second scale plate.

RAYMOND J. PIERI. JOHN B. DE MATTIA.

